Abstract
not intended to imply that they were different from the widespread, tiny, eight-rowed race from numerous older sites from Tehuacan, Mexico, to Ayacucho, Peru. The cobs from these and other sites in New Mexico are only one starting point for an evolution of one form ofMaiz de Ocho as it acquired the two recessive genes for a thick rachis (Galinat 1969), then became adapted to shorter growing seasons with longer day-lengths, and finally, with a correlated response, evolved its largest kernels in upstate New York and Ontario after a 400-year spread starting at about A.D. 700 in the Southwest (Galinat and Gunnerson 1963). Selection for early flowering may have started in the U.S. Southwest as a means to
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